Portable power supply



FIG. 1 is a front perspective view of an embodiment of an ornamental design for a portable power supply showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of the area “9” shown in FIG. 1;

FIG. 10 is an enlarged view of the area “10” shown in FIG. 2; and,

FIG. 11 is an enlarged view of the area “11” shown in FIG. 8.

The broken lines depict portions of the portable power supply in which the design is embodied that form no part of the claimed design.

The shade lines in the figures show contour and not surface ornamentation. 

CLAIM The ornamental design for a portable power supply, as shown and described. 